Determine Screen Size

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Slightly odd question here: is there a way to determine the screen size... I'm not so interested in the pixel resolution, but more the physical size of the screen.

I've got an item that reacts when tapped, but, on my Iphone which has a small screen this is completely obscured by my finger, and I'd like to move it so you can see what's going on... but, I couldn't see a good way of doing this...